Mechanical properties of recycled aggregate concrete prepared with old concrete with different strength grades

Title: Mechanical properties of recycled aggregate concrete prepared with old concrete with different strength grades
Author(s): Shi-cong Kou and Chi-sun Poon
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 720 - 729
Total Pages: 10
Nb references: 25
Language: English

Abstract: In this paper, the results of a study on the mechanical properties of recycled aggregate concrete (RAC) prepared with recycled aggregate (RA) that are derived from five old concrete with different strength grades are presented. The experimental study was divided into two parts. Firstly, the parent concretes with 28-day strengths of 30, 45, 60, 80 and 100 MPa were prepared, and then they were crushed to produce recycled aggregates in the sizes ranges of coarse aggregates (5-10 mm and 10-20 mm). Secondly, the different types of recycled aggregates were used to replace natural granite at percentages of 0% and 100%, for producing new concrete mixes. The RAC were produced with a water/cement ratio of 0.50 and a cement content of 390 kg/m3. The properties such as slump, compressive strength, splitting tensile strength, elastic modulus and UPV of the RAC were determined. The results indicated that the initial slump values of the new concrete increased with increasing strength grades of the parent concrete from which the recycled aggregates were derived. When compared with the natural aggregate concrete, the use of RA derived from all grades of parent concrete decreased the compressive strength of the RAC. However, the reduction in strength of the RAC decreased with increasing parent concrete strength. The strength of the RAC with RA derived from 80 and 100 MPa parent concretes was similar to the corresponding natural aggregate concrete.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00